🔋 About Me

Currently, I am completing my last year of Ph.D degree at the Center for Advanced Electrical Machines & Drives (CAEMD), Huazhong University of Sci. & Tech. (HUST), advised by Professor Ronghai Qu.

I am currently looking for any opportunities for a postdoc and research assistant position in the field of power electronics or electrical machine. Here is my CV. . Contact information: ziruiliu24@gmail.com, ziruiliu@hust.edu.cn.

My research includes high power density synchronous machine nonlinear system identification, sensorless control, real-time thermal modelling and temperature estimation. I have published 10+ papers on IEEE Transactions and top EE conferences .

⚙️ Skills

Programming: C, Matlab, Python, LaTeX

Tools: Simulink, Embedded Coder, Altium Designer, JMAG, Pspice

📝 Publications

Part I: Nonlinear Parameter Identification & Control

• IEEE TPE Improved small-signal injection-based online multiparameter identification method for IPM machines considering cross-coupling magnetic saturation Zirui Liu, Xinggang Fan, Wubin Kong, Longfei Cao, Ronghai Qu

• IEEE TIE Online Multi-Parameter Observation of IPM Machine with Reconstructed Nonlinear Small-Signal Model Based on Dual EKF Zirui Liu, Wubin Kong, Xinggang Fan, Ronghai Qu

Part II: AC Machine Position Sensorless Control

• IEEE TPE Analytical Approach for Position Observation Error Correction in IPMSM Sensorless Drives Using Online Multi-Parameter Estimation Zirui Liu, Bohan Shen, Wubin Kong, Xinggang Fan, Kai Peng, Ronghai Qu

• ECCE 2023 Online Multiparameter Estimation with Position Error Correction for Unified Synchronous Machine Sensorless Drives Zirui Liu, Wubin Kong, Xinggang Fan, Fei Wang, Ronghai Qu

• IEEE TIA Online Multiparameter Estimation with Position Error Correction for Unified Synchronous Machine Sensorless Drives Early Access Zirui Liu, Wubin Kong, Hengyang Liu, Kai Peng, Fei Wang, Ronghai Qu

Part III: Real-time Thermal Modelling and Temperature Estimation

• IEEE TPE Hybrid Thermal Modeling with LPTN-Informed Neural Network for Multi-Node Temperature Estimation in PMSM Zirui Liu, Wubin Kong, Xinggang Fan, Zimin Li, Kai Peng, Ronghai Qu

• IEEE DataPort Hybrid Thermal Modeling with LPTN-Informed Neural Network for Multi-Node Temperature Estimation in PMSM Zirui Liu, Wubin Kong, Xinggang Fan, Zimin Li, Peng Kai, Ronghai Qu.

Others

• ICEMS 2019 A Capacitor Voltage Sorting Algorithm for Modular Multilevel Converters(MMC) under Low-Frequency Carrier Modulation Zirui Liu, Wenjuan Yu, Haifeng Guo, Wubin Kong, Chun Gan, Ronghai Qu

• IEEE TEC A Computationally Efficient Semi-Analytical Method for Circulating Current Loss of High Speed Permanent Magnet Machines Lei Li, Xinggang Fan, Zirui Liu, Dawei Li, Tianjie Zou, Xiaoxue Chen, Ronghai Qu

• IEEE TTE A Novel Adaptive Nonlinear Reaching Law for DC-link Voltage Control of DC-biased Vernier Reluctance Generator Zimin Li, Wubin Kong, Zirui Liu, Bohan Shen, Ronghai Qu

• J. Power Electron. Active zero-sequence voltage injection modulation strategy for capacitor current suppression in dual sector PMSM systems Yifei Shao, Wubin Kong, Zirui Liu, Haifeng Guo, Longxiao Wang, Ronghai Qu

• IEEE JESTPE A multi-Frequency Equivalent Harmonic Modeling Method for Digital Discontinuous PWM Haifeng Guo, Yifei Shao, Wubin Kong, Zirui Liu, Liangling Li, Ronghai Qu

• IEEE TPE Modeling and Optimization Algorithm of Coupling Noise for SiC MOSFET Active Gate Driver Considering Common-Source Inductance Hengyang Liu, Wubin Kong, Gen Long, Hangchuan Lou, Xianglong Wu, Dawei Li, Zirui Liu, Minghai Dong, Zian Zhao, Yixue Wen

• SEEE Parameter Identification for DC-biased Vernier Reluctance Motor Considering Harmonic Current and Inverter Nonlinearity Songbai Yang, Wubin Kong, Zimin Li, Zirui Liu

• IEEE JESTPE Dead-Time Compensation Based on Current Phase Estimation for High-Frequency Cascaded Transformer Multilevel Inverter Hengyang Liu, Xianglong Wu, Wubin Kong, Gen Long, Hangchuan Lou, Zirui Liu, Dawei Li.

• CIEEC 2023 Sensorless Control and Inductance Parameter Identification of PMSM Based on Two-Orientation High-Fequency Square Wave Injection Haowen Zheng, Jiarui Hao, Ming Zha, Zirui Liu, Wubin Kong

• IEEE TIE Improved LPTN-Based Online Temperature Prediction of Permanent Magnet Machines By Global Parameter Identification Longfei Cao, Xinggang Fan, Dawei Li, Wubin Kong, Ronghai Qu, Zirui Liu

• IEEE TIA Comparison of heat transfer characteristics of the hollow-shaft oil cooling system for high-speed permanent magnet synchronous machines Runyu Wang, Xinggang Fan, Dawei Li, Ronghai Qu, Zirui Liu, Lei Li

🔨 Projects

High Temperature, High Power Density Intergated PMSM

100kW High Temperature Intergated PMSM System

• Fully integrated oil cooling.

• Dual margin Controller with SiC MOSSFET power module, total system efficiency is 92%.

• Operating Ambient Temperature can up to 150 \(^\circ\)C.

• Total Power Density 4.82 kW/kg (Larger than the latest aerospace SP200D series from Siemens, which power density is 3.8 kW/kg).

1200V Cascaded Multilevel Converter

1200V Cascaded Multilevel Converter

• Fundamental Frequency range from 20k to 50kHz.

• DSP+FPGA framework with optical-fiber communication between master and slave submodules.

• Forced air cooling.

• Single Phase Structure with 8 H-bridge submodules based on SiC MOSFET discrete devices.

• Output voltage up to 1200V AC, maximum output power is 6.5 kW.

12kVA Interleave DC/DC & DC/AC SynRM Controller

12kVA Interleave Bidirectional DC/DC & Three Phase DC/AC Controller SynRm System for Engine Integrated Stator/Generator

• Interleave bidirectional DC/DC for synchronous reluctance machine drive and battery charging.

• 12kVA capacity with a compact Integrated design.

• Three layer controller & Power electronic drive & Power loop PCB design.

• Parallel design of multi silicon MOSFET design for cost sensitive application.

Low Voltage 1kW Electrical Pump System

Low Voltage 1kW Electrical Pump System

• Integrated design of cooling channel, high speed pmsm and Si MOSFET controller with Metal Additive Manufacturing.

• 28V 10,000 r/min low voltage high speed SPMSM.

• Low cost resistor-based phase current sampling with position sensorless control.

• The system software is fully based on Matlab Embedded Coder Designer .

IPMSM Test Platform for EV application

IPMSM Test Platform for EV Application

• 60kW IPMSM Test Platform with back-to-back .

• Up to 20 Temperature Sensors installed inside different positions inside the controller, stator and rotor.

• Raspberry Pi 5 function as a semi host computer for real-time thermal modelling and complex algorithm execution.

• The system software is fully based on Matlab Embedded Coder Designer .

All-in-one Electrical Motor Controller for EV Thermal Control

All-in-one Thermal Controller for EV Application

• One 8kW 400~720V IPMSM drive with sensorless control for air compressor.

• Three 150W, 12V BLDC drive with sensorless control.

• Five 12W, 12V stepping motor drive.

• Three 1A, 12V electrical valve.

🏆 Honors and Awards

• Three times National Scholarship (2016, 2017, 2024)
• Four times The first prize Scholarship (2018, 2022, 2023, 2024)
• Three times Merit Student (2016, 2017, 2018)
• 2017.03 Meritorious Winner in The Mathematical Contest in Modeling (MCM)
• 2017.11 The Second prize of Hunan Area in The National Undergraduate Electronic Design Contest
• 2021.11 Outstanding Winner in the Huawei Future Smart Car Creative Innovation Competition (The competition prize is 100,000 yuan)

📖 Academic Service

• Journal Reviewer

IEEE Transactions on Power Electronics

IEEE Transactions on Transportation Electrification

IEEE Journal of Emerging and Selected Topics in Power Electronics

IEEE Transactions on Industrial Informatics

• Conference Reviewer

The 7th International Electrical and Energy Conference 2024 (CIEEC 2024)

The 26th international Conference on Electrical Machines and Systems 2023 (ICEMS 2023)

The 6th International Electrical and Energy Conference 2024 (CIEEC 2023)

The 3rd China International Youth Conference on Electrical Engineering (CIYCEE 2022)

💻 Internships

• 2021.02 - 2021.04, Huawei Intelligent Vehicle Solutions BU, Shanghai, China.